Remove Blank Lines

Hello,

I have a massive list of Business names & Addresses.

like:

Business Name A
address 1
address 2
Address 3
postcode
opening times



Business Name B
address 1
etc
etc


Between each company, there is 3 blank rows.
How can I remove 2 of the blank rows and just leave 1

I started doing it manually, but there is over 14000 rows...

please help.



Thanks